Michael knapp and john knapp



@nitro tatrs @anni @frn MieHAEL KNAPP AND JOHN KNAPP, or HUDSON orrv,'New JERSEY.

d unlocked.

vLetters Patent No. 70,576, dated November v5, 1867.

IMPROVEMENT IN DOOR-(LOCKS.

TO ALL WHOM IT MAY CONCERN: Y

Be it known that we, MICHAEL KNAPP and JOHN K NAPP, of Hudson City, inthe county of Hudsomand State of New Jersey, 'have invented a new andimproved Door-Lock; and we do hereby declare that thc fol-v lowing is afull, clear, and exact description thereof, which will enable othersskilled in the art to make and use the same, reference being had to theaccompanying drawings, forming part of this specification, in which-Figure 1 represents a. Side view of our improved lock, the front-platebeing removed, and the bolt being Figure 2 is a similarview, showing thebolt vin the locked position.

Figure 3 is a vertical :cross-section of thesamc, the planeof sectionbeing indicated' by the line a: fr, iig. 2.

Figure 4' is an end view'of the key. Y

Similar letters of reference indicate like parts. l

This invention relates to a. door-lock, in which'compound tumblers'areused, the main tumbler being locked by an auxiliary tumbler whenever thedoor is locked, while, when unlocked, the bolt'is perfectly free, andcan be moved'dire'ctly by the key. The parts are so arranged that thekey can only bel turned in one direction, both for locking andunlocking. By the application ofthe auxiliary tumbler the bolt is heldfirm when locked, -and cannot be moved back by pressing from theoutside, which is the casein most spring-bolt locks.

A represents thecase of the loci( B is the bolt, to the tail end ofwhich a spiral spring, a, is secured, which has the tendency to draw thebolt in; C is a bar, which is arranged parallel with the bolt B, andwhich has two tumblers, b bfwhich' project at right angles from its endstowards the bolt B. A spring, c, prcsses the ends of the tumblers b bagainst the bolt B. These tumblersrb are guided between lugs d d, whichare stationery-*arranged in the case A, as shown. The key-hole is in thesquare or oblong space formed between the oolt Band the bar C. When thekey is inserted through the key-hole, and turned in the direction of thearrow lin iig. lfgits' end will' (the bolt B being unlocked) strikeagainst a lug or shoulder, e, formed on the bolt, "and will move th'csame forward into the position shown in iig. 2. As soon as tworeccsscs,ff, n the bolt B, como opposite' to the ends of the tumblers bb, the latter will be thrown into these recesses bythe spring c, andwiltl thus lock the bolt B while the latter locks the door. Forunlocking, the key is turned in the samedireetion as for locking, andcomcsin'eontact with the har C, and throws it back against the spring c;thereby the tumblers 1 Z are withdrawn from the rccesscsfand the bolt Bis again released, Vwhen the spring a will draw it in again, and thedoor will be unlocked. All those movements are very simple, and such alock can be opened by anyu key, the bit of which is sufficiently long.To make it more diliicultto open, one or more secondary tumhlers D maybe arranged above the bar C, in the manner shown. 'lhcse secondarytumblers t through arecess in the upper part ofthe tumblersb and guidesd, as shown. The recesses in the latter are broader 'than that portionof theseconda'ry tumbler that passes through them, so as to allowthemotion of the arm C. That portion of the secondary tumbler which isin the tumblcrs B when Vthe bolt B is unlocked, is broader than theother parts,as shown in igs. 1 and 2. A shoulder, g, is formed on cachend of cach secondary tumbler D,l,and a spring, 1t,- has the tendency todraw the secondary tumblers towards theouter side of the lock. When thebolt B is unlocked, the

secondary tumblcrs lie in the position shown in g. 1, and cannot bemoved longitudinally, as the broader parte in the tumblers tit betweenthe guides cZ. While the bolt is being locked, the secondary tumblersare carried towards the bolt B by the tumblers b until their broadportions come in line with the recesses in the guides d. The spring tthen draws thc secondary tumblers forwardin the same direction in whichthe bolt is moved, so that their broad portions are drawn into therecess which is formed in the guides d. The shoulder g, at the tailendvof the secondary tumbler, prevents the same from being drawn bythespring t further than is shown in iig. 2. The broad parts of thesecondary tumblers will thus be in the recesses in and d at- 'the sametime, as shown, and wiil thus completely lock the tumblers b, preventingthem from being withdrawn from the bolt'B'. Not until the broad portionsof the secondary tumblers are withdrawn from the recesses in d will thekey have power to withdraw thetn'mblers b from the bolt B, and therebyunlock the latter. It will be seen that the motion` to be imparted tothe secondary tumblers by the key is at right angles to that of thetumblers b, and consequently the key must be so constructed that it willmove the one in the direction ofthe arrow 2, and the other in that ofthe arrow 3. For thispurpose we have provided the bit Eef the key withlugs j, whichv project from itssides, as shown in tig. 4. These lugs tinto recesses or against shoulders in the secondary tumblers,

and draw the same in direction of the arrow 2. Then the key will be ableto push the tumblers b out oi' the bolt B.

What We claim as new, and desire to secure by Letters Patent, is

1. 4Guiding the secondary tumbler D through the slotted guides d andthrough the grooved tumblers I Z1, said secondary tumbler provided withthe projections g, as described, and connected with the spring h,operating asnnd for the purpose specified.

2. The combination and arrangement of the bolt B, tumhl'ers b1),"secondary tumblers D guides LI, :and

springs a c z, all operating as described, for the purpose specified.A i

3. So cons tructinga. lock that the same can only be locked and unlockedby turning thc key in one dil-cetion only, as set forth,

MICHAEL KNAPP, Y JOHN KNAPP.

Witnesses:

JOHN LEITZ, DANIEL KLENEM.

